The most important thing to remember about marathon training is that the goal is to become aerobically fit and extremely strong. To do that you will need to run a lot of miles, long runs with some quality, long intervals w/ short recovery, and plenty of recovery time in between. Shorter intervals, track work, VO2 work, etc. is going to do little or nothing to improve you marathon ability. Some examples of typical marathon workouts are below.
These workouts are from Renato Canova(sp?)...
Aerobic Power Workouts (one per week):
1) 10 x 800 w 1:30 jog @ 110-112% of MP
2) 6 x 1 mile w 2 min jog @ 108-109% of MP
3) 4 x 2 mile w 3 min jog @ 105-106% of MP
4) 3 x 3 mile w 4 min jog @ 103-104% of MP
5) 2 x 5 mile w 5 min jog @ 101-102% of MP
6) 6 mile continuous run @ 104-105% of MP
7) 8 mile progression run @ 100-106% of MP
Aerobic Endurance Workouts (one per week):
1) 18-22 miles steady run @ 90-95% of MP
2) 24-26 miles easy run @ 80-85% of MP
3) 18-22 miles progression run @ 85-100% of MP
4) 12-15 miles simulation run @ 100% of MP
5) 20 miles - last 5-10 miles @ 100% of MP
6) 20 miles incorporating 10 x 800 @ 103% of MP w 800 jog
7) 6-7 miles @ 85% + 6-7 miles @ 100% of MP (workout done AM and PM)
Remaining runs each week are done at an easy 80-85% of MP.
A 10 day cycle is a little difficult to use for most people because of work, family, etc. A 7 day cycle is simple and effective. Here is a basic outline that I use...
M- 1:15 total in 2 runs
T- 1:30 total drills and strides
W- 2:00 including an aerobic power workout
TH- 1:15 total in 2 runs
F- 1:30 total drills and strides
SA- 1:30 total including very light speedwork w/ full rec.
SU- 2:30-3:00 total including an aerobic endurance workout.
The above will give you a little over 90 mpw. That can be adjusted to run less or more milage.
If you have questions about a detailed marathon program including, total prep time, how to lay out the workouts, races, drills, core work, etc., let me know.